I suspect you'd get completely blank looks from an awful lot of people. Of those who understand the concept at all, the older generation might go for something like 'Lincolnshire Poacher', and baby boomers for 'Streets of London'. 'Dirty Old Town' would get a fair bit of recognition, but many people assume it's Irish. People old enough to remember S&G and The Graduate might name 'Scarborough Fair'. And then there are all those First World War and Music Hall songs that quite a few people seem to remember.

It really depends on whether you're talking about 'popular with folk music fans' or 'popular with the general public'.